diff --git a/packages/backend/src/misc/app-lock.ts b/packages/backend/src/misc/app-lock.ts
index 0891d021f..198310c88 100644
--- a/packages/backend/src/misc/app-lock.ts
+++ b/packages/backend/src/misc/app-lock.ts
@@ -12,29 +12,38 @@ const retryDelay = 100;
  * @param timeout Lock timeout (ms), The timeout releases previous lock.
  * @returns Unlock function
  */
-export async function getApLock(uri: string, timeout = 30 * 1000) {
+export async function getApLock(
+	uri: string,
+	timeout = 30 * 1000,
+): Promise<Mutex> {
 	const lock = new Mutex(redisClient, `ap-object:${uri}`, {
 		lockTimeout: timeout,
 		retryInterval: retryDelay,
 	});
 	await lock.acquire();
+	return lock;
 }
 
 export async function getFetchInstanceMetadataLock(
 	host: string,
 	timeout = 30 * 1000,
-) {
+): Promise<Mutex> {
 	const lock = new Mutex(redisClient, `instance:${host}`, {
 		lockTimeout: timeout,
 		retryInterval: retryDelay,
 	});
 	await lock.acquire();
+	return lock;
 }
 
-export async function getChartInsertLock(lockKey: string, timeout = 30 * 1000) {
+export async function getChartInsertLock(
+	lockKey: string,
+	timeout = 30 * 1000,
+): Promise<Mutex> {
 	const lock = new Mutex(redisClient, `chart-insert:${lockKey}`, {
 		lockTimeout: timeout,
 		retryInterval: retryDelay,
 	});
 	await lock.acquire();
+	return lock;
 }
diff --git a/packages/backend/src/remote/activitypub/kernel/announce/note.ts b/packages/backend/src/remote/activitypub/kernel/announce/note.ts
index acf8c8436..50b59932c 100644
--- a/packages/backend/src/remote/activitypub/kernel/announce/note.ts
+++ b/packages/backend/src/remote/activitypub/kernel/announce/note.ts
@@ -32,6 +32,8 @@ export default async function (
 	// Interrupt if you block the announcement destination
 	if (await shouldBlockInstance(extractDbHost(uri))) return;
 
+	const lock = await getApLock(uri);
+
 	try {
 		// Check if something with the same URI is already registered
 		const exist = await fetchNote(uri);
@@ -78,6 +80,6 @@ export default async function (
 			uri,
 		});
 	} finally {
-		await getApLock(uri);
+		await lock.release();
 	}
 }
diff --git a/packages/backend/src/remote/activitypub/kernel/create/note.ts b/packages/backend/src/remote/activitypub/kernel/create/note.ts
index fe4cc0906..92b0ffb1e 100644
--- a/packages/backend/src/remote/activitypub/kernel/create/note.ts
+++ b/packages/backend/src/remote/activitypub/kernel/create/note.ts
@@ -31,6 +31,8 @@ export default async function (
 		}
 	}
 
+	const lock = await getApLock(uri);
+
 	try {
 		const exist = await fetchNote(note);
 		if (exist) return "skip: note exists";
@@ -44,6 +46,6 @@ export default async function (
 			throw e;
 		}
 	} finally {
-		await getApLock(uri);
+		await lock.release();
 	}
 }
diff --git a/packages/backend/src/remote/activitypub/kernel/delete/note.ts b/packages/backend/src/remote/activitypub/kernel/delete/note.ts
index b37f7d25f..4656480c2 100644
--- a/packages/backend/src/remote/activitypub/kernel/delete/note.ts
+++ b/packages/backend/src/remote/activitypub/kernel/delete/note.ts
@@ -13,6 +13,8 @@ export default async function (
 ): Promise<string> {
 	logger.info(`Deleting the Note: ${uri}`);
 
+	const lock = await getApLock(uri);
+
 	try {
 		const dbResolver = new DbResolver();
 		const note = await dbResolver.getNoteFromApId(uri);
@@ -37,6 +39,6 @@ export default async function (
 		await deleteNode(actor, note);
 		return "ok: note deleted";
 	} finally {
-		await getApLock(uri);
+		await lock.release();
 	}
 }
diff --git a/packages/backend/src/remote/activitypub/models/note.ts b/packages/backend/src/remote/activitypub/models/note.ts
index 8e305d719..12b2c1997 100644
--- a/packages/backend/src/remote/activitypub/models/note.ts
+++ b/packages/backend/src/remote/activitypub/models/note.ts
@@ -415,6 +415,8 @@ export async function resolveNote(
 			`host ${extractDbHost(uri)} is blocked`,
 		);
 
+	const lock = await getApLock(uri);
+
 	try {
 		//#region Returns if already registered with this server
 		const exist = await fetchNote(uri);
@@ -437,7 +439,7 @@ export async function resolveNote(
 		// Since the attached Note Object may be disguised, always specify the uri and fetch it from the server.
 		return await createNote(uri, resolver, true);
 	} finally {
-		await getApLock(uri);
+		await lock.release();
 	}
 }
 
diff --git a/packages/backend/src/services/chart/core.ts b/packages/backend/src/services/chart/core.ts
index 2fce4de91..d7a524d48 100644
--- a/packages/backend/src/services/chart/core.ts
+++ b/packages/backend/src/services/chart/core.ts
@@ -430,6 +430,7 @@ export default abstract class Chart<T extends Schema> {
 			? `${this.name}:${date}:${span}:${group}`
 			: `${this.name}:${date}:${span}`;
 
+		const lock = await getChartInsertLock(lockKey);
 		try {
 			// ロック内でもう1回チェックする
 			const currentLog = (await repository.findOneBy({
@@ -465,7 +466,7 @@ export default abstract class Chart<T extends Schema> {
 
 			return log;
 		} finally {
-			await getChartInsertLock(lockKey);
+			await lock.release();
 		}
 	}
 
diff --git a/packages/backend/src/services/fetch-instance-metadata.ts b/packages/backend/src/services/fetch-instance-metadata.ts
index 9a5a9bb08..23a6a703e 100644
--- a/packages/backend/src/services/fetch-instance-metadata.ts
+++ b/packages/backend/src/services/fetch-instance-metadata.ts
@@ -15,6 +15,8 @@ export async function fetchInstanceMetadata(
 	instance: Instance,
 	force = false,
 ): Promise<void> {
+	const lock = await getFetchInstanceMetadataLock(instance.host);
+
 	if (!force) {
 		const _instance = await Instances.findOneBy({ host: instance.host });
 		const now = Date.now();
@@ -22,7 +24,7 @@ export async function fetchInstanceMetadata(
 			_instance?.infoUpdatedAt &&
 			now - _instance.infoUpdatedAt.getTime() < 1000 * 60 * 60 * 24
 		) {
-			await getFetchInstanceMetadataLock(instance.host);
+			await lock.release();
 			return;
 		}
 	}
@@ -78,7 +80,7 @@ export async function fetchInstanceMetadata(
 	} catch (e) {
 		logger.error(`Failed to update metadata of ${instance.host}: ${e}`);
 	} finally {
-		await getFetchInstanceMetadataLock(instance.host);
+		await lock.release();
 	}
 }